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http://hdl.handle.net/10773/34165
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DC Field | Value | Language |
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dc.contributor.author | Pinto, Rui | pt_PT |
dc.contributor.author | Arias-Serrano, Blanca | pt_PT |
dc.contributor.author | Yaremchenko, Aleksey | pt_PT |
dc.date.accessioned | 2022-07-18T11:24:08Z | - |
dc.date.available | 2022-07-18T11:24:08Z | - |
dc.date.issued | 2022-07 | - |
dc.identifier.uri | http://hdl.handle.net/10773/34165 | - |
dc.description.abstract | Rare-earth and alkaline-earth vanadates attract attention as prospective materials for electrochemical applications, in particular, as redox-reversible components for fuel electrodes of solid oxide fuel cells (SOFC). An essential advantage of (Ln,A)VOx-derived components of SOFC anodes is their anticipated resistance to carbon deposition and sulfur-containing impurities, which is critical for hydrocarbon- and biogas-fueled SOFCs. The present work was focused on the oxides of the PrVO4-Ca2V2O7 system as fuel electrode precursors, with an emphasis on phase formation, redox and thermomechanical behavior, and electrical properties. PrVO4, Ca2V2O7 and the ceramics with the nominal composition Pr1-xCaxVO4-d (x = 0.02-0.20) were prepared by the conventional solid-state route. Ceramics samples were sintered at 1000°C for Ca2V2O7 and 1300°C for other materials. XRD demonstrated the formation of phase-pure Pr1-xCaxVO4-d solid solutions with the tetragonal zircon-type structure for up to 5 at.% of calcium in Pr sublattice. At the same time, SEM/EDS suggest a lower solubility indicated by the presence of Ca-V-O phase impurities. Doping by calcium increases mixed ionic-electronic conductivity of Pr(Ca)VO4 ceramics under oxidizing conditions. The electronic contribution is p-type and decreases with reducing p(O2). The reduction of Pr1-xCaxVO4-d ceramics in a 10%H2-N2 atmosphere at 800°C leads to phase separation and formation of perovskite-like PrVO3 and CaVO3 phases. The redox behavior of PrVO4-Ca2V2O7 ceramics on isothermal cycling between air and 10%H2-N2 was studied by impedance spectroscopy, thermogravimetry, dilatometry and post-mortem XRD analysis. | pt_PT |
dc.description.sponsorship | FCT/MCTES/FEDER | pt_PT |
dc.language.iso | eng | pt_PT |
dc.relation | CARBOSTEAM (POCI-01-0145-FEDER-032295) | pt_PT |
dc.relation | LA/P/0006/2020 | pt_PT |
dc.relation | info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50011%2F2020/PT | pt_PT |
dc.relation | info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50011%2F2020/PT | pt_PT |
dc.rights | openAccess | pt_PT |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | pt_PT |
dc.subject | Solid oxide fuel cell | pt_PT |
dc.title | Phase relationships, electrical transport properties and redox behavior of oxides in the PrVO4-Ca2V2O7 system for SOFC applications | pt_PT |
dc.type | conferenceObject | pt_PT |
dc.description.version | published | pt_PT |
dc.peerreviewed | yes | pt_PT |
ua.event.date | 10-14 July 2022 | pt_PT |
degois.publication.firstPage | 422 | pt_PT |
degois.publication.title | International Conference Ceramics in Europe 2022 | pt_PT |
Appears in Collections: | CICECO - Comunicações |
Files in This Item:
File | Description | Size | Format | |
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abstract_CiE2022_p422.pdf | 1.37 MB | Adobe PDF | View/Open |
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